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Retekess TR640 - Page 20

Retekess TR640
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4.9.10 Software update
Press & to choose, and then pressENTERto confirm.
4.9.11 Reset to default
Press & to choose, and then pressENTERto confirm.
5. Matters Needing Attention
Before use, it needs to obey the following basic safety tips to ensure the safe and reliable use of the
product:
♦ Read and understand all safety guidelines and usage information.
♦ If the dry battery shows “ ” (blank), or the outer frame of “ ” is flickering, it indicates that the
battery is low. Then, update the battery to ensure the normal operation.
♦ If the machine is not used for a long time, please unplug the AC power supply and remove the dry
battery.
♦ Do not expose this radio in the rain, moisture, dripping or splashing any liquid.
♦ Do not put this radio near high temperature heat source, and do not barbecue or blow bake at
high temperature.
♦ Do not place it in direct sunlight for a long time.
♦ Do not let this radio fall or be hit, and put heavy things on it.

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